linux-kernel - Re: [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-based dm

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Date:	Thu, 02 Sep 2010 15:32:32 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Kiyoshi Ueda <k-ueda@...jp.nec.com>
CC:	Mike Snitzer <snitzer@...hat.com>, jaxboe@...ionio.com,
	j-nomura@...jp.nec.com, jamie@...reable.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-raid@...r.kernel.org, hch@....de
Subject: Re: [PATCH UPDATED 4/5] dm: implement REQ_FLUSH/FUA support for request-based
 dm

On 09/02/2010 03:22 PM, Tejun Heo wrote:
> Hello,
> 
> On 09/01/2010 09:15 AM, Kiyoshi Ueda wrote:
>> I don't see any obvious problem on this patch.
>> However, I hit a NULL pointer dereference below when I use a mpath
>> device with barrier option of ext3.  I'm investigating the cause now.
>> (Also I'm not sure the cause of the hang which Mike is hitting yet.)
>>
>> I tried on the commit 28dd53b26d362c16234249bad61db8cbd9222d0b of
>> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git flush-fua.
>>
>>     # mke2fs -j /dev/mapper/mpatha
>>     # mount -o barrier=1 /dev/mapper/mpatha /mnt/0
>>     # dd if=/dev/zero of=/mnt/0/a bs=512 count=1
>>     # sync
> 
> Hmm... I'm trying to reproduce this problem but hasn't been successful
> yet.
> 
>> BUG: unable to handle kernel NULL pointer dereference at 0000000000000078
>> IP: [<ffffffffa0070ec3>] scsi_finish_command+0xa3/0x120 [scsi_mod]
> 
> Can you please ask gdb which source line this is?

Ooh, never mind.  Reproduced it.

Thanks.

-- 
tejun
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